Best Firefox Plugins for WP (please add yours)

Aardvark (prior to 2.0 from https://karmatics.com/aardvark ; for 2.0 from https://www.designateonline.com/discussions/comments.php?DiscussionID=1149, thanks LesBessant!)

View Formatted Source (1.5+: https://addons.mozilla.org/firefox/697/ ; 2.0: https://mcuadros.es/2006/10/25/extension-view-formatted-source-en-firefox-20/ – I’ve heard that some people have trouble with this one, but it’s working fine for me)

MeasureIt (1.5+ and 2.0: https://addons.mozilla.org/firefox/539/ )

I’m all about Web Dev and IE Tab.

[edit] I might be all about measureIt that vkaryl just linked too!

Handy li’l sucker, Handyman! I too use ColorZilla, Web Dev and IE Tab, should have said I guess. Truthfully, what I use MOST is Aardvark and Web Dev. The others are priceless when you need them though!

Oh yeah, I love this built in validator:
https://users.skynet.be/mgueury/mozilla/
It goes great with the view source button in web developer.

A recent one I found that works similarly to the view element in the web dev is CSSViewer

I’ll add my support for the previously mentioned measureit(super useful, IMHO), Web Developer(reason I switched from Safari) and Colorzilla.